TS-2EXT Truing Stand Upright Extensions install in seconds on any TS-2 Truing Stand, allowing the stand to be used on wheels with hubs up to 160mm wide (tandem and downhill bikes), as well as on 700C wheels with a 29” mountain bike tire installed. In addition, specially sized bosses on the TS-2EXT serve as adaptors so the TS-2 Truing Stand can be used with wheels using 20mm through axle hubs.